The findings reveal a possible cellular pathway linking early binge drinking with altered adult behaviour.
HUNTINGTON, WEST VIRGINIA
Repeated alcohol exposure during adolescence disrupted communication between brain cells involved in learning, memory and emotional regulation, according to a preclinical study by researchers at Marshall University’s Joan C. Edwards School of Medicine.
The researchers used an adolescent intermittent-ethanol model in rats to simulate repeated episodes of heavy drinking. They examined the animals after an extended period without alcohol and again in adulthood, finding persistent structural and functional changes in the hippocampus, a brain region central to memory formation and learning.
The disruption involved communication between synapses, where neurons exchange signals, and astrocytes, cells once viewed mainly as structural support but now recognised as active participants in brain signalling. Alcohol exposure altered this relationship and was associated with heightened fear-related behaviour during adulthood.
Researchers partially reduced the abnormal fear response by stimulating calcium signalling within astrocytes. The intervention also increased the availability of chemical messengers used in cellular communication. This result suggests that astrocytes could eventually become therapeutic targets for addressing some long-term consequences of adolescent alcohol exposure.
The experiment was conducted in rats, so it cannot establish that identical cellular changes occur in teenagers or predict the effects of a particular drinking episode in humans. Nevertheless, the results complement human research associating adolescent binge drinking with poorer memory, attention and executive functioning. The study strengthens the warning that the developing brain may remain vulnerable to alcohol long after intoxication has ended.
La verdad es estructura, no ruido. / Truth is structure, not noise.